I got a wiggle on after this bump. All switches working super nicely after a clean with Electrolube EML200F contact cleaner and lubricant. There were 4 or five hesitant switches and it was clearly needing just a clean. These switches don’t separate so you have to spray onto them so some can get inside. Needed disassembly but not too tricky. The Nord is well put together and laid out- super impressed by its guts and how these components have lasted ( this is for a NR2 ) the pots are silky smooth and firm.
Sorted a guitar amp I have had since 80s out with this lubricant too - well worth the modest cost.